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INVESTMENTS - SCHEDULE OF AMORTIZED COST, GROSS UNREALIZED GAINS AND LOSSES, ESTIMATED FAIR VALUE, AND ALLOWANCE FOR CREDIT LOSSES (Details) - USD ($) $ in Millions | Jun. 30, 2026 | Mar. 31, 2026 | Dec. 31, 2025 | Jun. 30, 2025 | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | --- | --- | --- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Amortized cost | $ 26,580.2 |  |  |  |  |
Allowance for credit losses | (41.5) | $ (43.9) | $ (36.0) | $ (39.1) | $ (38.9) | $ (37.1)
Estimated fair value | 24,495.7 |  | 23,886.8 |  |  |
Corporate securities |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Amortized cost | 14,999.6 |  | 14,568.8 |  |  |
Gross unrealized gains | 38.0 |  | 137.1 |  |  |
Gross unrealized losses | (1,480.8) |  | (1,413.2) |  |  |
Allowance for credit losses | (35.3) | $ (37.8) | (30.2) | $ (33.1) | $ (33.1) | $ (31.1)
Estimated fair value | 13,521.5 |  | 13,262.5 |  |  |
United States Treasury securities and obligations of United States government corporations and agencies |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Amortized cost | 211.5 |  | 207.2 |  |  |
Gross unrealized gains | 0.0 |  | 0.1 |  |  |
Gross unrealized losses | (32.6) |  | (30.2) |  |  |
Allowance for credit losses | 0.0 |  | 0.0 |  |  |
Estimated fair value | 178.9 |  | 177.1 |  |  |
States and political subdivisions |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Amortized cost | 3,269.2 |  | 3,311.4 |  |  |
Gross unrealized gains | 19.7 |  | 25.1 |  |  |
Gross unrealized losses | (383.0) |  | (378.9) |  |  |
Allowance for credit losses | (2.8) |  | (2.9) |  |  |
Estimated fair value | 2,903.1 |  | 2,954.7 |  |  |
Foreign governments |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Amortized cost | 133.5 |  | 130.9 |  |  |
Gross unrealized gains | 0.6 |  | 0.9 |  |  |
Gross unrealized losses | (11.5) |  | (10.7) |  |  |
Allowance for credit losses | (1.0) |  | (0.6) |  |  |
Estimated fair value | 121.6 |  | 120.5 |  |  |
Asset-backed securities |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Amortized cost | 1,989.8 |  | 1,780.8 |  |  |
Gross unrealized gains | 6.0 |  | 14.0 |  |  |
Gross unrealized losses | (48.8) |  | (47.4) |  |  |
Allowance for credit losses | (0.1) |  | (0.1) |  |  |
Estimated fair value | 1,946.9 |  | 1,747.3 |  |  |
Agency residential mortgage-backed securities |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Amortized cost | 711.5 |  | 838.3 |  |  |
Gross unrealized gains | 6.7 |  | 11.4 |  |  |
Gross unrealized losses | (0.9) |  | (0.2) |  |  |
Allowance for credit losses | 0.0 |  | 0.0 |  |  |
Estimated fair value | 717.3 |  | 849.5 |  |  |
Non-agency residential mortgage-backed securities |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Amortized cost | 1,474.5 |  | 1,639.1 |  |  |
Gross unrealized gains | 30.0 |  | 37.5 |  |  |
Gross unrealized losses | (78.3) |  | (90.9) |  |  |
Allowance for credit losses | 0.0 |  | 0.0 |  |  |
Estimated fair value | 1,426.2 |  | 1,585.7 |  |  |
Collateralized loan obligations |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Amortized cost | 1,597.7 |  | 1,142.4 |  |  |
Gross unrealized gains | 2.7 |  | 2.8 |  |  |
Gross unrealized losses | (2.6) |  | (2.7) |  |  |
Allowance for credit losses | 0.0 |  | 0.0 |  |  |
Estimated fair value | 1,597.8 |  | 1,142.5 |  |  |
Commercial mortgage-backed securities |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Amortized cost | 2,192.9 |  | 2,157.5 |  |  |
Gross unrealized gains | 2.9 |  | 6.4 |  |  |
Gross unrealized losses | (111.1) |  | (114.7) |  |  |
Allowance for credit losses | (2.3) |  | (2.2) |  |  |
Estimated fair value | 2,082.4 |  | 2,047.0 |  |  |
Total fixed maturities, available for sale |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Amortized cost | 26,580.2 |  | 25,776.4 |  |  |
Gross unrealized gains | 106.6 |  | 235.3 |  |  |
Gross unrealized losses | (2,149.6) |  | (2,088.9) |  |  |
Allowance for credit losses | (41.5) |  | (36.0) |  |  |
Estimated fair value | $ 24,495.7 |  | $ 23,886.8 |  |  |

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